Billed for unknown, unexplained service service

When I received my billing invoice on 13/05/2015, I saw I was charged service fees of R3,793.86 dated 04 May 2015. I phoned to inquire this, they could not tell me for what I was billed. I checked the date, the only service I have requested was to move my existing line to a new home address (this is free of charge according to Telkom's adverts and the call centre agent) Other than this I have not requested any other service. S I logged a dispute, which should be resolved around 10 days, I phoned several times but got no feedback or assistance (they said I should wait) I even went to a Telkom store where I also got no help. I called again on 29 May (13 days after the complaint). The lady just said it's not resolved and I should wait some more. So I don't know how much to pay and Telkom doesn't even know what they bill me for...?